Pavement.



- added for the same purpose.

thinli, of the variable nature or such prod-v "AZILIER HASSAM, Ul WORCESTER, MASSACHUSETTS, ASSIGNOR TO HASSAM PAVING .I'l, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

PAVE ME HT.

Application filer]. August 26, 1907.

Specification of Letters Patent.

Patented Feb. 9, 1909.

Serial No. 390,244.

. State of Massachusetts, have invented a new and ful Pavement, of which the following is spe 'fication.

This invention has particular reference to pavements, and the object of the same is to provide a new and improved wearing surface ch shall possess the necessary qualities to make a smooth and enduring structure.

The invention is particularly adapted to provide surface layer which can be used on any desired foundation, and particularly on the foundation described and claimed in patent granted to me on the first day of May, 1906, No. 819,652.

Various compositions have been proposed for pa and similar purposes, involving m xtures of asphalt and the like with liquid volatile solvents, and with other materials On account, I

: it has been found impossible in practice to combine them in such a way as to get an. absolutely uniform product. In other words,

when these compositions have been blended at different times in exactly the same proportions and apparently with exactly the same treatment, compositions have been l d of widely varying characters. es when pavement has been laid that is i durable quality capable of lasting "'0 several years, another pavement prepared and laid in the same way so far as can be ascertained, will last only a year or two.

The principal object of the presentinvention is to provide a composition and process of making and treating it which will be absolutely uniform under all conditions when mixed in the same proportions and in the same way. This is accomplished by a mixture of hydroline with tanpitch and sand in certain proportions with or without the addition of tar.

' The invention is practiced as follows :I prepare a mixture with tar pitch and hydroline which is a commercial artiordiirry temperature,. which abou l" and is uniform i nearly pure bitut of the distillation of a ut the proportions droline, about 40 per cent. of coal tar pitch, and from to per cent. of sand. This compound is then thoroughly mixed with graded stone. This is done while the mixture is hot. When the graded stone is thoroughl coatedwith the mixture, the same is sprea upon the foundation and is rolled to give a smooth surface. Usually line stone and gravel is also spread and rolled thereon. When the same sets, an admirable avement wearing surface is formed whic is smooth and which will stand much wear. In some instances I add to the mixture a percentage of tar, preferably coal tar, of about 20 per cent. of the mixture of hydroline, coal tar pitch and sand. I also preferably employ a fibrous binding agent to assist in holding the composition together, and of such a nature that it will not rot or deteriorate when exposed to the weather as it must be when the composition is used for -pavemehts. Asbestos is the fibrous material which I prefer to use.- .It is mixed with the above described composition, either having the tar therein, or not, in suitable proportions, and when the mixture has set it acts to bind the parts together to prevent the cracking of the pavement.

The proportions herein mentioned may be varied within certain limits, but I have found in practice that if varied within wide limits, the above mentioned'uniformity will not be obtained. In other words, it is necessary to have about the percentage of hydroline which has been referred to above in order to secure a product which will always be the same. I

Having thus fully described my invention, what I claim and desire to secure by Letters- Patent is 1. The method of making a top or wearing surface for pavements which consists in mix ing hydroline, coal tar pitch and sand in substantially the proportions specified, heating the mixture, mixing graded stone in the same while hot, spreading the coated stone on a suitable foundation, and rolling the same to give a smooth surface.

A pavement having its wearing surface formed of graded stone coated with hydroline, pitch, and sand in substantially the pro portions specified, said coated stone being spread out and rolled to form a wearing surface.

3. A pavement having its Wearing surface formed of stone coated with a mixture of hydrh' ne, pits? Band, @1141 afibmus-z binding; A wm'position for pavements and the mammal 1n stammlay the pmpamsns like, snpnsmg sand, pitch, and over 40% dessnbed f zlyciroime. I

40 A paw-mam; having its wsarmg surface in testimony whereof I have hereunto set 15 formed of stone coated wlth a mature 01? .A" hand 1n. the m'esence of two subscnbm 1 Q l I Q a hyarohne, watch, sand and asbestos 1n sub mtnesses. stant-ially emoportions described. QM

5. Apammenthgvmgincorporated there WALTER E HASS m a mlxtura of hycimlma, prick, ssmd, and Wfinesses: bar m subsmmxafi" ii-3:16 pmmrtwns de ELRZABETH M. BARR J 1 '1 7 scnbad. hawma EL JOHNSON. 

